Projector.



F. H. DOYLE 11. WALLACE.

PROJECTOR. APPLICATION FILED NOV. I. 1915.

Patented Jan. 21, 1919.

2 SHEETS-SHEEI I.

IIIIIIIII F. H. DOYLE 1. 1. WALLACE. PROJECTOR.

APPLICATION FILED NOV-1,1915. 1,291,793, Patented .1311. 21, 1919.

1 2 SHEETS-s111112.

VITNESSES:

sary vfor keeping the carbons in focus.

UNITED STATES PATENT oEEicE.

FRANK E. DOYLE AND JOHN WALLACE, 0F SAN FRANCISCO',

CALIFORNIA, ASSIGNORS T0 SAFETY-GRAPH EDUCATIONAL FILM COMPANY, INC., OF RENO, NEVADA, A CORP PDB .ATION 0F NEVADA.

PROJECTOR.

Specification of Letters Patent.

Application filed November 1, 1915. Serial No. 59,071.

To all wzom t may concern:

Be it -known that we, FRANK H. DoYLE and JOHN WALLACE, citizens o f the United States, residing at the city and county of San Francisco and State of California, have invented a new and useful 1mprovement in Projectors,vof which ythe following is a specification.

This invention relates to projectors, and has for its objectlto provide a self-contained projecting device which is simple, compact, safe and easily operable, and which is particularly adapted for use in school rooms and for othereducational and entertainment purposes where one not possessed of special training or experience, may, with ease, ac-

curately operate the device without danger of causing a Ere or injury to himself or tol the various parts of the device.

' 1n carrying out this object, we employan arc lamp of simple and improved construe@ tion requiring a minimum of adjustments and a housing of safe and economical constructiondesigned to contain the lamp and all appurtenances, said parts being so arranged that the operator may adjust the points of the carbons in the lamp from his position at the side of the housing adjacent to the doors thereof. A

The only practical motion picture projecting machines now on the market pose are standard machines which are expensive, both in initial cost and maintenance.

.In order to come into general and accepted .use for educational or amateur entertainhousing and embodying a minimum of necesb sary 'adjustments for the carbpns. The pres ent device includes all that is necessary or desirable in a device for the screwing in of the carbons and the use yof intricate devices which are claimed to be necesan improved system of ventilation and the for any pur- 4a condenser box `vperforations 22 in its sides.

projection ofv motion pictures and does daway with the use of heat insulating material for carrying the electrical parts of the device, we have succeeded in producing what may be termed a practically reproof lamp-house.

One form which our invention may assume is exemplified in the following description and illustrated in the accompanying drawings, in which` Figure 1 shows a vertical, sectional view of a device embodying our invention, taken on line 1-1 of Fig. 3.

Fig. 2 shows a side elevation of a similar device. j

Fig. 3A shows a vertical, transverse, sec= tional view taken on the line 3 3 of Fig. 1.

Fig. 4 shows an end elevation of the lamphouse.

Fig. 5 shows a diagram of the electrical parts employed.

Fig. 6 shows a detail of a modi'ded form of the carbon holders.

Fig. 7 shows a detail view of the condenser box.

Referring in detail to the drawings, a lamp-house is shown, having a base 10, of asbestos or other heat insulating material, carried upon legs 11, -which legs are'slidably attached to a stand 12 by means of transverse rods 12a. The body portion of the housing, which is preferably box-shaped in form, is made up of sheet metal side walls 13, end walls 1/1 and ceiling 15.v In one of the sides 13 is a pair-of hinged doors 16, and 1 7 is iitted to one of the end walls 14 and carries the condensers 18.

In the base 10 there is provided a Vent opening 19, preferably rectangular in form, and the ceiling 15 has a similar opening 20, covering which is a pent house 21 having A. shield 23 is litted within the pent house and comprises a top` portion having two downwardly extending sides and one downwardly extending end portion, being so positioned as to cause the heat passing upwardly through said housing to travel through thespaces 24 etween the vertical walls of the shield and the surrounding pent house.

A standard is carried within the housing and comprises an upstanding portion 25 and an angular foot portion 26, adjustably connected together by means of a slot and bolt. 27. The foot portion 26 of the standard is carried upon a base-plate 28, which base-V y -non-adjustably secured to the tion 10 of the housing and operates within guide members 29 to move longitudinally of v the housing.

A toothed rack 30 is fixed tothe foot portion 26, and meshing therewith is a pinion 31 carried upon a stem 32 journaled in the lower portion of the side wall 13, adjacent lto the hinged doors and provided with a hand-wheel 33, by means of which the pinion is turned to cause the rack and connected parts to be moved back and forth within the housing. Carried upon the standard 25 is a, pair of carbon holders 34, each comprising a contact device which, in the preferred form, is in the shape of a spring metal plate 35 having a trough-shaped, outer end 35Il to receive a carbon stick 36, and adjustably attached to the standard, by means of slot and screw connections 37, and in the case of the modified form shown in Fig. 6 in the shape of a pair of grooved rollers 38 preferably holder. An

insulated adjusting roller39 coperates with each contact device to form a channel for the rece tion of the carbon stick.

eans are provided for manually operating each of the adjusting rollers' 39, which means are in the form of 'outwardly pro-'f jecting stems 40, each passing through a slot 41 in one of the doors 16 and carrying-at its outer end a hand-wheel 42. A washer or shield is carried on each of the stems adj acent` to the position occupied by the closed doors and'serves to cover the slot 41.

The holders 34 are' each carried upon the standard 25 in an oblique position approximately at right angles to each other so that the carbon sticks are projected forwardly in an oblique, 'perpendicular position. Thus the lcarbon sticks will be capable of' ready focusing and burn evenly for a longer period of time without feeding motion.

The described arrangement of the adjustable standard and adjustable carbon holders enables an operator to insert new carbon sticks vs '.thout making any wire connections and provides an adjustment for the carbons 'toward and from the condensers through the hand-wheel 33; a feeding motion of the individual carbon sticks through the handlwheels 42 (and, in the case of the spring 'metal plates 35, an adjustment of the carbon socket whereby to admit various sized carbon sticks) and also a vertical adjustment of the standard. 25, through .the connection 27 whereby to vary'theelevation of the focal point of the car ns to suit condenser plates of different diameters.

A resistance board 44, of asbestos or `'other heat insulating material, is mounted within the housing adjacent tothe side wall 13 thereof, opposite the doors, being spacedapart at its ends and sides and held in position by means of brackets 45. Resistance coils 46 are carried upon the board 44 berality of perforations 47 is provided for the said wall for the purpose of dissipating the heat generated by the coils. Immediately above said coils, and in the ceilingl, is a row of perforations 48 also for carrying away the heat. A control board 49, also of asbestos or heat insulating material, is arranged upon the end 1,4 of the housing .opposite the end occupiedby the condenser plates and carries the various electrical control devices for the arc lamp, including a control switch 50, socket 51, rheostat arm 52 and fuse plugs 53.

The wiring diagram of the electrical ap.- paratus, as shown in Fig. 5, provides for the cutting in and out of the resistance coils, so that all may be employed in series when it is desired to decrease the voltage of current delivered to the arc, or any number of or all of the same may be cut out when it is desired to increase the voltage of current.

.Either alternating or direct current may be employed in the operation of the present lamp, and where direct current is used, the circuit is from the positive pole or the socket 51, through a conductor a, to one of the fuses,

thence through wire b to the control switch pole of the socket by wire z.

h, through the other fuse and Upon one of the doors 16 of the housing is arranged a square tube' 54, containing two pieces of translucent material 54a, one at each end of the tube, and having marked thereon lines in intersecting planes which indicate the focal point of the carbon sticks when the parts are operated as intended. This feature is of great convenience to the inexperienced operator as it enables him to maintain the adjustment of the carbons in proper position at all times.

It is desirable that various combinations u and arrangements of the condenser plates be permitted, and this we provide for by the means shown in Fig. 7, where it will be seen that the plates are `held within the boX 17 by meansof screw-threaded rods 56, one at each corner, carrying nuts 57 engaging with the'plates and operable to permit the same to be moved toward and from each other or to admit plates of various thicknesses.

The combination of a lamp house, resistance, coils, switches, fuses and rheostat in one piece of apparatus makes a compact arrangement which is safe and easy to operate. Ventilation of the lamp house so dissipates the heat generated by the electrical current that the housing is practically free on the condenser plates,

y carried on by an inex vention as disclosed in the ard lamp houses. The arrangement of the carbon holders and standard therefor makes it possible to secure many adjustments to meet various requirements. Once thecarbons have been given the proper adjustment the operation of the two hand-wheels 42 is all that is necessary for and this bein carried on from the side of the housing adjacent tothe point where the reel unwinder is usually arranged, the operation of the lamp becomes much easier and capable of being erienced operator. enser box is the usual holder 58 to receive a hood 59 for motion picture purposes, or, in case the device is being usedl to project stereopticon views, said holder is adapted to receive slide plates '(not shown). 1

The carbon sticks 36 being arranged' obliquely and tending toward a horizontal line, it is animpossibility to get them out of focusonce they are set in proper relation to the condenser plates. Where the carbons are in substantially alined position, as in other projecting machines, the rapidity with which one of the sticks burns yin a direct line' In front of the con away from the other carries the source of l light away from the center of the condenser plates and throws the projection out of focus. With the present arrangement of the carbons', while one stick may, on direct current,burn faster than the other, the somewhat horizontal disposition of the sticks revents a rapid shifting of the source of light away from the focal line and consequently the arc will break, due to wide separation of the carbon points, before it gets out of focus with the condenser plates.

Also, in this same connection, viz, the improved arrangement lof the carbon sticks, the arc will burn longer without feeding movement of the carbons than' where the sticks are in near longitudinal alinement.

' The slidable connection between the legs 11 and stand 12 permits 'lateral adjustment of the housing, which is of great convenience where a motion-picture head is secured fxedly to the stand and it is desired to project stereopticon views without disturbing said head. The operator then merely has to move the housing laterally on its support to position for clearing the head. Y It is obvious that many changes Y in the construction and arrangement of the several parts of the apparatus may be employed without departing from the spirit of our inappended claims. Having thus described our invention, what we claim and desire to secure by Letters Patent is- 1. lIn a projecting device, a housing having vent openings in its top and bottom, arcfocusing the light j holders,

light electrodes within, an adjustable holder for each of said electrodes, an adjustable standard for said holders, doors in one side .0f said housing in a plane at right angles to the lens, means projecting through said doors and operable from the exterior thereof for adjustin said electrodes to and from each other in t eir holders, and a board of insulating material carrying resistance coils arranged within said housing at the side opposite the doors and spaced apart from the walls of the housing.

2 In a projectin machine,- a housing, a lens at the front, olders within carrying arc-light electrodes, double hinged doors arranged at one side .of said housing at right angles to the lens, and turnable rods projecting between said doorsand operable from the exterior thereof to give a feeding motion to the electrode holders.

' a projecting machine, a housing, a lensat the front, holders within carrying arc-light electrodes, double hinged doors arranged at one side of said housing at right angles to the lens, turnable rods projectln between said doors and fitting in elongated slots in one of said doors and opera-ble from the exterior thereof to supply a feeding motion to the electrodes, a standard for said and means ,for adjusting said standard toward and from the lens when the doors are closed.

4. In a projecting machine, a housing, electrode holders each comprismg a channeled contact member and a grooved disk, the latter coperating with the channeled portion of said lmember to form a socket to receive a pencil electrode, spring means for pressing said channeled portion toward said disk, means for adjusting said contact member relative to the disk to accommodate electrodes of various sizes, and means for rotating said disks to feed the electrodes.

disk, means for securing said main body portion to the sup orting plate, andmeans for rotating said dlsks to feed the electrodes.

Instestimony. whereof we Lhave hereunto set our hands in the presence of two subscrlbing witnesses.

FRANK' H. DoYLE.

j lJOHN wALLAcE.

WitnTesseszH HEREIN OHN L G w. w. Hmm. 

